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  #1  
Old 06-04-2012
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Sealant recomendation

Hi All...

I need to rebed a window. The windows has bolts to hold it in, so I need a sealant, not an adhesive. A few years ago the best stuff used to be something made by 3M, but they discontinued it. At that point I went to Silkins, but that's very thin.

I know I could use butyl tape, but I am wondering what the current thinking is on the best non-adhesive sealant that is somewhat thick and has no silicon in it?

Thanks...
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Old 06-04-2012
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Re: Sealant recomendation

I went through this last month. Resealed two glass windows. Google Boatlife polysulfide. Sticks well, remains flexible but it cures slowly. It attacks some plastics though.

BoatLIFE | LifeCaulk Sealants and Polysulfides
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Re: Sealant recomendation

Here is the 3m selection guide :

Marine Sealant & Marine Adhesive Guide : Marine Supplies : 3M Europe

Looks like they recommend 4400 according to the table.

There's also Life Seal, which is what I've been using lately. It's a silicon/polyurethane blend which cleans up easily with acetone. Despite having silicon in it, I've found no problems in areas where I've removed it and then painted - just cleaned with acetone first.
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Sika- sandable and paintable - topsides or bottom. Better than any product on the market, especially 3M or silicone products.
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Re: Sealant recomendation

Quote:
Originally Posted by erps View Post
I went through this last month. Resealed two glass windows. Google Boatlife polysulfide. Sticks well, remains flexible but it cures slowly. It attacks some plastics though.

BoatLIFE | LifeCaulk Sealants and Polysulfides
I really am not clear when I should use LifeCaulk, and when I should use LifeSeal. Do you know the answer?
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Old 06-04-2012
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Re: Sealant recomendation

I highly recommend butyl rubber for this and have done this on my own boat. Lots of threads on the subject.
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Re: Sealant recomendation

Yeah they do, but everything above 3200 is an adhesive, which I don't want or need. I really prefer not to use adhesives when there are mechanical fasteners holding things together. 3200 has silicon in it and I really don't like to use silicon based products.

That's a good point about making asure the sealant is compatible with the type of plastic. As I recall, there are two different types of plastics predominantly used for windows, and I need to use the right sealant. Problem is, I don't know which type of plastic this window is made from.

That might not be an issue though. The plastic window is sealed to a frame, and I don't think the leak is is between the plastic and the frame, but rather the frame and the boat. But I won't know until I get it apart and fill the window with water to see if it leaks.

Surely there is a sealant available that is non-adesive, thick and contains no silicon?
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Re: Sealant recomendation

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Originally Posted by sea_hunter View Post
Sika- sandable and paintable - topsides or bottom. Better than any product on the market, especially 3M or silicone products.
Sikaflex 291 would be my choice, except its very thin. Unless my memory is failing, it just runs all over the place.
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Sealant recomendation

3M Ultra Glaze is what I used. Don't know if they still sell it but seals well and pliable. Is black and messy to work with, though!
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Re: Sealant recomendation

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Originally Posted by bwindrope View Post
I highly recommend butyl rubber for this and have done this on my own boat. Lots of threads on the subject.
Seconded. Buy it from MaineSail.
Bedding Deck Hardware With Butyl Tape.
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